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Conditionally Remove Dataframe Rows with R [duplicate]
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Logic index:
d<-d[!(d$A=="B" & d$E==0),]
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CSS3滚动条美化效果 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...sparent;
}
::-webkit-scrollbar-track {
box-shadow: 1px 1px 5px rgba(0,0,0,.2) inset;
}
::-webkit-scrollbar-thumb {
min-height: 20px;
background-clip: content-box;
box-shadow: 0 0 0 5px rgba(0,0,0,.2) inset;
}
::-webkit-scrollbar-corner {
background: transparent;
}
如...
优化InnerHTML操作 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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</div>
<script>
document.onmousedown = function() {
for (var i = 0; i < 10; i++) {
var p = document.createElement("p");
p.appendChild(document.createTextNode(Math.random()));
document.getElementsByTagName('div')[0].appendChild(p);
}
};
</script>
</body>...
Discuz 证件类型下拉框不显示的解决方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...NSERT INTO `pre_common_member_profile_setting` VALUES ('idcardtype', 1, 1, 0, '证件类型', '身份证 护照 驾驶证等', 0, 0, 0, 0, 0, 0, 0, 'select', 0, '身份证\n护照\n驾驶证', '');
执行后更新缓存再看前台页面，证件那类型下拉框是不是出来了？是不是很...
css中@media screen and (-webkit-min-device-pixel-ratio:0)解析 - 更多技...
css中@media screen and (-webkit-min-device-pixel-ratio:0)解析@media screen and (-webkit-min-device-pixel-ratio:0) {.down_info caption h5{height:60px; line-height:60px;}}Webkit内核浏览...
@media screen and (-webkit-min-device-pixel-ratio:0) {
.down_info caption h5{height:60px; line-height:60...
位置传感器经纬度为0的问题 - 用户反馈 - 清泛IT社区，为创新赋能！
Pursuer丶:
想问下appinventor位置传感器调试一直是0,0是为什么
清泛:
[图片]
清泛:
看看是不是权限问题
Pursuer丶:
是这样的
Pursuer丶:
他刚进来的时候是好的 然后跳到第二个屏幕 再返回第一个 就变0,0了
Pursuer丶:
一开...
How to abort an interactive rebase if --abort doesn't work?
...o the commit it expects.
git update-ref refs/heads/master b918ac16a33881ce00799bea63d9c23bf7022d67
Then, abort the rebase again.
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Sourcemaps off by one line in Chrome, with Ruby on Rails, Webpack, and React JS
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answered Jul 10 '15 at 4:02
AgamennonAgamennon
18677 bronze badges
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Rounding DateTime objects
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130
Floor
long ticks = date.Ticks / span.Ticks;
return new DateTime( ticks * span.Ticks );
Round...
Edit a commit message in SourceTree Windows (already pushed to remote)
... is
not the most recent commit) using SourceTree for Windows version 1.5.2.0:
Step 1
Select the commit immediately before the commit that you want to edit.
For example, if I want to edit the commit with message "FOOBAR!" then I need
to select the commit that comes right before it:
Step 2
Right...